An armpit rash is often caused by irritation from sweat, friction, soap, or dryness. It could also be an allergic reaction to fragrances or propylene glycol (a deodorant ingredient). Other causes of ...

An armpit rash can be uncomfortable or even painful. Often, the cause is mysterious, but you can treat the conditions at home. Sometimes, however, an armpit rash is severe enough to require a trip to ...